import types

class A:
    def test(self): ...

print(type(A().test) is types.MethodType)
print(A().test.__code__)
A().test.__code__ = None

True
<code object test at 0x00000236894BB660, file "c:\Users\Avasam\Desktop\import types.py", line 4>
Traceback (most recent call last):
  File "c:\Users\Avasam\Desktop\import types.py", line 8, in <module>
    A().test.__code__ = None
AttributeError: 'method' object has no attribute '__code__'